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Finding the Fourth Proportional to 485.41, 728.41 and 211.50

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Solution

The fourth proportional to 485.41, 728.41 and 211.50 is: 317.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.41 : 728.41 = 211.50 : x
  2. Step 2: Convert to fraction form
    485.41/728.41 = 211.50/x
  3. Step 3: Cross multiply
    485.41x = 728.41 × 211.50
  4. Step 4: Simplify right side
    485.41x = 154,058.72
  5. Step 5: Solve for x
    x = 154,058.72/485.41
  6. Step 6: Final answer
    x = 317.38

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.